Adjustable shelf unit



FIG. 1 is a perspective view of an adjustable shelf unit showing my new design, shown broken away to indicate indeterminent length;

FIG. 2 is an elevational view taken from the right of FIG. 1, the side opposite being a mirror image thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is top plan view thereof; and

FIG. 6 is a bottom plan view thereof. 

The ornamental design for an adjustable shelf unit, as shown and described. 